Maximum allowable operating temperature for
angular contact precision ball bearings corresponds to the
limiting value below which no geometrical and structural changes
occur. This value depends on material and relevant heat treatment
adopted.
SNFA bearing rings are stabilized to attain a temperature
of 150° C; stratified textile – resin or polyamide
cages can attain a maximum temperature of 120° C.
During operation, the internal bearing temperature is much
brighter than that measured by probes placed close to the
rings.
This situation is particularly critical in the case of rigidly
preloaded bearings operating at high speed since danger local
overheating at the ball to race contact area can occur.
This event, that leads to bearing seizure, can be avoided
by ensuring that the temperature measured by the probe is
well below the values indicated above. In the case of grease
lubricated bearings, the situation is already critical when
the temperature of the outer and/or inner ring is over 55°
C, as the grease deteriorates rapidly.
Temperature limits are much higher with oil lubrication and
depend on the lubrication system used.
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GRW
Product Desc.